IDEA: Configure collator language depending on info provided by visited file

[davorpa]

Defeat

Having a merelly { language: "your lang" } as config object is a bit simple when remark is applied in a multilanguage project.

remark-lint-alphabetize-lists/lib/alphabetical-list-items.js

Line 17 in ee5f968

function alphaCheck(tree, file, language = 'en-US') {

If some rules about naming files are ensured (eg. by path [folder]/en-US/some-markdown-file.md or by file [folder]/some-markdown-file.en-US.md), something very common in software development, it will be easier use this plugin with zero config.

Proposal

Add a new config parameters to enhace it.

Draft:

• "language-resolver": null: a regex pattern or a function to extract the lang slug using visited tree/file info.
• "default-language": "en-US": fallback language, when is not supported by Intl webapi or other Collator package.

Use remark-frontmatter plugin could be the best option to extract this info if some microblogging static generators like Jekyll, Hugo, ... are used in the project. So... another param??

• "use-frontmatter": true

An example of language-resolver can be found at fpb-lint-cli: https://github.com/vhf/free-programming-books-lint/blob/b72812e3cf51e0dce322a30d465f50ee618f3d0c/lib/lint.js#L59-L70